hadoop 問題

1：wrong value class: class org.apache.hadoop.io.Text is not class org.apache.hadoop.io.IntWritableclas

解決：setCombinerClass 和reduce的類型不一直。注掉setCombinerClass

 job.setMapperClass(Map.class);

  job.setReducerClass(Reduce.class); 

   //  job.setCombinerClass(Reduce.class);